Video - Install of K&N intake for 1999-2004 Chevy Silverado, GMC Sierra 1500 with 4.8L and 5.3L engines57-3021-1 - K&N has designed a performance air intake system for the Chevy Silverado 1500 and GMC Sierra 1500 4.8L and 5.3L. K&N dynamometer tests show an estimated gain of 9.12 horsepower at 5352 RPM with use of this K&N air intake modification. K&N tests multiple vehicles for each air intake system it makes to ensure a consistent horsepower and torque gain. This video demonstrates the steps needed to install a power gaining K&N air intake into Chevy Silverado 1500 and GMC Sierra 1500 with the 4.8L and 5.3L engines.